X-ray-induced electrical conduction in the insulating phase of thiospinel CuIr2S4

Abstract

Effects of x-ray irradiation on the crystal structure and the electrical resistance were examined at low temperatures for the insulating phase of spinel compound CuIr2S4. We found that the resistance decreases by more than five decades by irradiation at 8.5 K. The structural change from triclinic to tetragonal was observed at the same time. The x-ray-induced conductance is deduced to result from the destruction of Ir4+ dimers formed in the insulating phase. Slow relaxation of the resistance in the x-ray-induced state is also reported.

18 pages with 6 figures, pdf format, to be published in Solid State Commun

References in corpus (1)

• X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr${}_2$S${}_4$

Cited by in corpus (6)

• Optical study of the metal-insulator transition in CuIr${}_2$S${}_4$ crystals
• In-gap state and effect of light illumination in CuIr${}_2$S${}_4$ probed by photoemission spectroscopy
• X-ray induced electronic structure change in CuIr${}_2$S${}_4$
• First-order kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr${}_2$S${}_4$
• Orbitally-driven insulator-metal transition in CuIr${}_2$S${}_4$: Temperature dependent transient reflectivity study
• Reexamination of the charge-ordered dimer pattern in the spinel compound CuIr2S4 using single-crystal synchrotron x-ray diffraction